Don't build so many capitals! They will die from focus-fire. Even if they don't, its still a bad idea because capitals will share experience with other capitals in the same grav-well.
5 is the maximum no. of capitals you should have. 3 is usually better, but it depends on your strategy and which race you are playing as.
As TEC, it is best to get a Kol or Marza first. The Akkan and/or Dunov are good second choices. Get a Sova if you are going to Embargo ruch him. The Sova teams up well with the Marza.
As Advent ALWAYS get a Mothership first. Then get a Radiance and/or Halcyon. Halcyon is great for boosting the firepower of your fleet. Rapture is nice too. Never bother with the Revelation.
As Vasari, you have to get the Evacuator first. The Skirantra is a good choice if you are defensive. Vulkoras is good second choice if you are aggresive. Kortul should come later. Only get the Marauder if you plan on raiding alot.
As to fleet size and no. of fleets, it is best to have 1 main fleet with a few small fleets. The main fleet should have most of your caps. You should have 1 or 2 smaller fleets. Vasari are better at dividing their forces then the other races as phase stabilisers greatly reduce travel time.
